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arXiv 1305.0232astro-ph.CO
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恒星形成星系的辐射场:盘、薄盘和核球

Radiation fields in star-forming galaxies: the disk, thin disk and bulge

C. C. Popescu, R. J. Tuffs

摘要:

我们提供并描述了一个图书馆的弥漫恒星辐射场的旋涡星系来自使用的主要形态组件-磁盘,薄磁盘,和凸起-通过尘埃星际介质的恒星辐射传输的计算。这些辐射场是自相一致的解决方案的综合全色光谱能量分布(SED)先前提出的使用相同的模型。因此,从辐射场计算的可观测量,如伽马射线或无线电发射,可以自洽地与紫外/光学/亚毫米SED的解决方案相结合,从而将辐射传输模型的适用范围扩展到更宽的波长和物理量范围。我们还给出了辐射场的解析解在光学薄恒星盘,在恒星盘与一个尘埃盘和恒星盘与两个尘埃盘。直射光的解析解是精确的,可以用作基准。散射的解析解只是近似的,只有在极端的光学厚度极限下才变得精确。我们发现强烈对比的磁盘,薄磁盘和凸起的辐射场的空间分布的解决方案。对于凸起,我们发现一个强烈的依赖Sersic指数的辐射场。

英文摘要:

We provide and describe a library of diffuse stellar radiation fields in spiral galaxies derived using calculations of the transfer of stellar radiation from the main morphological components - disks, thin disks, and bulges - through the dusty interstellar medium. These radiation fields are self-consistent with the solutions for the integrated panchromatic spectral energy distributions (SEDs) previously presented using the same model. Because of this, observables calculated from the radiation fields, such as gamma-ray or radio emission, can be self-consistently combined with the solutions for the ultraviolet/optical/submillimeter SEDs, thus expanding the range of applicability of the radiation transfer model to a broader range of wavelengths and physical quantities. We also give analytic solutions for radiation fields in optically thin stellar disks, in stellar disks with one dust disk and in stellar disks with two dust disks. The analytic solutions for the direct light are exact and can be used as benchmarks. The analytic solutions with scattering are only approximate, becoming exact only in the extreme optically thick limit. We find strongly contrasting solutions for the spatial distribution of the radiation fields for disks, thin disks and bulges. For bulges we find a strong dependence of the radiation fields on Sersic index.

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